linux-kernel - Re: [PATCH 2/2] PCI: mvebu: add support for orion5x

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Message-ID: <Ytgwl53POEjWPoeN@lunn.ch>
Date:   Wed, 20 Jul 2022 18:43:03 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Pali Rohár <pali@...nel.org>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Mauri Sandberg <maukka@....kapsi.fi>,
        linux-pci <linux-pci@...r.kernel.org>,
        DTML <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
        Gregory CLEMENT <gregory.clement@...tlin.com>,
        Russell King - ARM Linux <linux@...linux.org.uk>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Subject: Re: [PATCH 2/2] PCI: mvebu: add support for orion5x

> If we have free 256MB in physical address space, then we can implement
> it easily. It is just changing _size_ argument. I'm not sure how much
> DDR RAM has Orion, but if only 2GB then we should be fine (remaining 2GB
> should be enough for all peripherals + 256MB for PCIe config space).

All the Orion5x devices i've seen have had small amounts of RAM, 64MB,
maybe 128M. It seems very unlikely there are any with 2GB for RAM. So
i don't see a problem with taking 256MB of physical addresses for PCI.

  Andrew